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Stock Compensation - Summary of Stock Options Activities (Details)
$ / shares in Units, $ in Thousands
9 Months Ended
Sep. 30, 2018
USD ($)
$ / shares
shares
Disclosure of Compensation Related Costs, Share-based Payments [Abstract]  
Number of Options, Outstanding Beginning Balance | shares 930,300
Number of Options, Granted | shares 387,500
Number of Options, Exercised | shares
Number of Options, Forfeited | shares (249,000)
Number of Options, Expired | shares (144,300)
Number of Options, Outstanding Ending Balance | shares 924,500
Number of Options, Exercisable | shares 163,000
Weighted Average Exercise Price Per Share, Outstanding Beginning Balance | $ / shares $ 5.63
Weighted Average Exercise Price Per Share, Granted | $ / shares 4.70
Weighted Average Exercise Price Per Share, Exercised | $ / shares
Weighted Average Exercise Price Per Share, Forfeited | $ / shares 5.72
Weighted Average Exercise Price Per Share, Expired | $ / shares 4.84
Weighted Average Exercise Price Per Share, Outstanding Ending Balance | $ / shares 5.26
Weighted Average Exercise Price Per Share, Exercisable | $ / shares $ 5.23
Weighted Average Remaining Contractual Term, Beginning Balance 8 years 8 months 12 days
Weighted Average Remaining Contractual Term, Ending Balance 8 years 6 months
Weighted Average Remaining Contractual Term, Exercisable 7 years 8 months 12 days
Aggregate Intrinsic Value, Beginning Balance | $ $ 150
Aggregate Intrinsic Value, Ending Balance | $
Aggregate Intrinsic Value, Exercisable | $